Hotfix/dx12 cubemap lookup (#921)

* Disable Dx12 half tests. The half-calc test runs, but is not actually doing any half maths. If the code is changed such that it is, the device fails when the shader is used. This can be seen by looking at dxil-asm.

* Fix using software driver for dx12 even when hardware is requested.

* * Refactor Dx12 _createAdapter such that it doesn't have side effects and stores desc information
* Disable half on dx12 software renderer because it crashes

* * Disable erroneous warnings from dx12
* Test for adapter creation
* Identify warp specifically

* Structured buffer test now works on dx12.

* Fix intemittent crash on dx12.
Due to if a resource was initialized with data, the actual resource constructed might be larger, for alignment issues. This led to a memcpy potentially copying from after the allocated source data and therefore a crash. Now only copies the non aligned amount of data.

* * Rename the test to use - style
* Disable TextureCube lookup in tests, as does not produce the correct result in dx12 (will fix in future PR)

* Updated hlsl.meta.slang.h that has rcp for glsl.

* * Fix bug where the SRV description was incorrect for cubemaps on dx12
* Re-enable cube map access in dx12 tests
* Slightly re-organize texture upload on dx12 to not repeatidly create and destroy upload resource for array/cube scenarios

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